On Mon, Mar 17, 2003 at 08:16:12AM -0500, Sam Varshavchik wrote:
This release adds a new tunable parameter that controls processing of mail queue backlogs; adds Solaris IPv6 support, and fixes a number of bugs.
Sam,
I have an observation about the new queuefill parameter. When I initially tried it, it worked as I expected it to. Yesterday I was doing some more tests, and it seemed not be working, so this afternoon, I conducted the following controlled test (queuelo=200, queuehi=400, queuefill=5m):
time action -------------- t injected 20 msgs for host A (host A unreachable, queuedeliverying=20) t+10 injected 380 msgs for host B (host B also unreachable, queuedelivering=400) t+20 injected 20 msgs for host C (all delivered in a few seconds, queuedelivering=380)
So I expected the queuefill timer to expire at t+310 and trigger a refill of the queue, to refill the 20 messages for host A that had been evicted to make space for messages for host C. This is because at t+10, the high watermark was reached.
However, at t+310, nothing happened. queuedelivering was still at 380, and courier was making attempts to deliver messages to host B, and getting deferrals. At t+610, the queue still hadn't re-filled. The queue was eventually refilled to queuehi (400) at t+1h, when courierd restarted.
Have I missed something? Or is there a bug in the code?
What happened, probably is that first twenty messages got deferred quickly before the second batch got fully injected. They got kicked out of the queue before the next 380 messages came in, so the in-memory queue never reached the high watermark.
When mail gets deferred, it is removed from the in-memory queue. The timer only starts ticking when the queue high watermark is reached.
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